diff options
| author | Nathan Fontenot <nathan.fontenot@amd.com> | 2021-01-25 11:34:49 -0600 |
|---|---|---|
| committer | Shuah Khan <skhan@linuxfoundation.org> | 2021-01-26 09:40:15 -0700 |
| commit | a0255a76bf3a78d322adfe4eb4e73eb83998f61a (patch) | |
| tree | b721317391188d6476567bb9f8b7dc85e7fe1afb | |
| parent | 7a136a8fcd7ef14c63d07667e81c4dcac77e0a13 (diff) | |
cpupower: Add CPUPOWER_CAP_AMD_HW_PSTATE cpuid caps flag
Add a check in get_cpu_info() for the ability to read frequencies
from hardware and set the CPUPOWER_CAP_AMD_HW_PSTATE cpuid flag.
The cpuid flag is set when CPUID_80000007_EDX[7] is set,
which is all families >= 10h. The check excludes family 14h
because HW pstate reporting was not implemented on family 14h.
This is intended to reduce family checks in the main code paths.
Signed-off-by: Nathan Fontenot <nathan.fontenot@amd.com>
Reviewed-by: Robert Richter <rrichter@amd.com>
Reviewed-by: skhan@linuxfoundation.org
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
| -rw-r--r-- | tools/power/cpupower/utils/helpers/amd.c | 9 | ||||
| -rw-r--r-- | tools/power/cpupower/utils/helpers/cpuid.c | 12 | ||||
| -rw-r--r-- | tools/power/cpupower/utils/helpers/helpers.h | 1 |
3 files changed, 14 insertions, 8 deletions
diff --git a/tools/power/cpupower/utils/helpers/amd.c b/tools/power/cpupower/utils/helpers/amd.c index 34368436bbd6..8b69c7ff639a 100644 --- a/tools/power/cpupower/utils/helpers/amd.c +++ b/tools/power/cpupower/utils/helpers/amd.c @@ -94,11 +94,10 @@ int decode_pstates(unsigned int cpu, unsigned int cpu_family, union core_pstate pstate; unsigned long long val; - /* Only read out frequencies from HW when CPU might be boostable - to keep the code as short and clean as possible. - Otherwise frequencies are exported via ACPI tables. - */ - if (cpu_family < 0x10 || cpu_family == 0x14) + /* Only read out frequencies from HW if HW Pstate is supported, + * otherwise frequencies are exported via ACPI tables. + */ + if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_HW_PSTATE)) return -1; if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val)) diff --git a/tools/power/cpupower/utils/helpers/cpuid.c b/tools/power/cpupower/utils/helpers/cpuid.c index f9a66a430b72..d577220a193b 100644 --- a/tools/power/cpupower/utils/helpers/cpuid.c +++ b/tools/power/cpupower/utils/helpers/cpuid.c @@ -128,9 +128,15 @@ out: /* AMD or Hygon Boost state enable/disable register */ if (cpu_info->vendor == X86_VENDOR_AMD || cpu_info->vendor == X86_VENDOR_HYGON) { - if (ext_cpuid_level >= 0x80000007 && - (cpuid_edx(0x80000007) & (1 << 9))) - cpu_info->caps |= CPUPOWER_CAP_AMD_CPB; + if (ext_cpuid_level >= 0x80000007) { + if (cpuid_edx(0x80000007) & (1 << 9)) + cpu_info->caps |= CPUPOWER_CAP_AMD_CPB; + + if ((cpuid_edx(0x80000007) & (1 << 7)) && + cpu_info->family != 0x14) + /* HW pstate was not implemented in family 0x14 */ + cpu_info->caps |= CPUPOWER_CAP_AMD_HW_PSTATE; + } if (ext_cpuid_level >= 0x80000008 && cpuid_ebx(0x80000008) & (1 << 4)) diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h index a84f85a9dbd2..5f61eefff5b2 100644 --- a/tools/power/cpupower/utils/helpers/helpers.h +++ b/tools/power/cpupower/utils/helpers/helpers.h @@ -70,6 +70,7 @@ enum cpupower_cpu_vendor {X86_VENDOR_UNKNOWN = 0, X86_VENDOR_INTEL, #define CPUPOWER_CAP_IS_SNB 0x00000020 #define CPUPOWER_CAP_INTEL_IDA 0x00000040 #define CPUPOWER_CAP_AMD_RDPRU 0x00000080 +#define CPUPOWER_CAP_AMD_HW_PSTATE 0x00000100 #define CPUPOWER_AMD_CPBDIS 0x02000000 |